101Leafy researched the games.
Blue Ogre Sword

Supreme Dragonsword. Causes even mountain like wyverns to tremble with fear.
| Class | Sword |
|---|---|
| Rarity | 8 |
| Attack | 266 |
| Dragon | 10 |
| Slots | 2 |
| Price | 85,000z |
Upgrades
| Upgraded from | Flaming Pair |
|---|---|
| Upgrades into | Azure Ogre Sword |
Can also be made new at the smithy.
Upgrade tree from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 704.
Materials
Azure LaoS Horn ×2, Azure LaoS Shell ×5, Lao-Shan's Claw ×4, Commendation ×1